The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Itta Kawamura - One of the best experts on this subject based on the ideXlab platform.
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Validation by Cardiac Catheterization of Noninvasive Estimation of Time Constant of Left Ventricular Pressure Decline as an Index of Relaxation by Speckle Tracking Echocardiography
The American journal of cardiology, 2018Co-Authors: Takashi Yoshizane, Itta Kawamura, Masanori Kawasaki, Ryuhei Tanaka, Maki Nagaya, Koji Ono, Shingo Minatoguchi, Hidemaro Sato, Shinji Tomita, Hitoshi MatsuoAbstract:There has been no established echocardiographic parameter to accurately assess left ventricular (LV) relaxation. Impaired LV relaxation assessed by the time constant of LV Pressure Decline (Tau) is one of the major components of diastolic dysfunction. We sought to noninvasively estimate Tau (eTau) by speckle tracking echocardiography (STE) and to validate the eTau against Tau by catheterization. Tau was reported to be calculated using the isovolumic relaxation time (IVRT), LV end-systolic Pressure, and left atrial (LA) Pressure. We reported that pulmonary capillary wedge Pressure (ePCWP) can be noninvasively and accurately estimated as 10.8 − 12.4 × Log (LA active emptying function/minimum LA volume index). Therefore, the eTau by STE is noninvasively calculated using the formula: eTau = IVRT / (ln 0.9 × systolic blood Pressure−ln ePCWP). Echocardiographic parameters were measured just before catheterization in 110 patients with cardiac disease (age 72 ± 8). There was a good correlation between the eTau and Tau by catheterization (r = 0.69, p 48 ms) was 77% and 91%, respectively, with area under curve of 0.87 using an optimal cutoff of 48 ms. Bland-Altman analysis revealed a good agreement between the eTau and Tau. In conclusion, this study demonstrated that the eTau by our noninvasive method has a good correlation with Tau obtained by cardiac catheterization. LV relaxation may be noninvasively and accurately estimated by STE.
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Abstract 14584: Noninvasive Estimation of Time Constant of Left Ventricular Pressure Decline as an Index of Relaxation by Speckle Tracking Echocardiography; Validation Study by Cardiac Catheterization
Circulation, 2016Co-Authors: Itta Kawamura, Masanori Kawasaki, Ryuhei Tanaka, Takashi Yoshizane, Takashi Kato, Maki Saeki, Maki Nagaya, Koji Ono, Makoto Iwama, Masazumi AraiAbstract:Background: There has been no established echo parameter to accurately assess left ventricular (LV) relaxation as diastolic function. LV relaxation assessed by time constant of LV Pressure Decline (Tau) using left heart catheterization is reported to be deteriorated even in the early stage of hypertension. Thus, it is important to noninvasively evaluate LV relaxation in various cardiac diseases. We sought to noninvasively estimate Tau (eTau) by speckle tracking echocardiography (STE) and to validate eTau by Tau measured by cardiac catheterization. Methods: Isovolume relaxation time (IVRT) was reported to be measured as the time between end of LV outflow wave and beginning of inflow wave by Doppler echo. We reported that pulmonary capillary wedge Pressure (ePCWP) was accurately estimated as 10.8 - 12.4 x Log (left atrial active emptying function / minimum left atrial volume) by STE. Thus, the eTau by echo was obtained using the formula: eTau = IVRT / (ln 0.9 x systolic blood Pressure - ln ePCWP). Echo para...
Takashi Yoshizane - One of the best experts on this subject based on the ideXlab platform.
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Validation by Cardiac Catheterization of Noninvasive Estimation of Time Constant of Left Ventricular Pressure Decline as an Index of Relaxation by Speckle Tracking Echocardiography
The American journal of cardiology, 2018Co-Authors: Takashi Yoshizane, Itta Kawamura, Masanori Kawasaki, Ryuhei Tanaka, Maki Nagaya, Koji Ono, Shingo Minatoguchi, Hidemaro Sato, Shinji Tomita, Hitoshi MatsuoAbstract:There has been no established echocardiographic parameter to accurately assess left ventricular (LV) relaxation. Impaired LV relaxation assessed by the time constant of LV Pressure Decline (Tau) is one of the major components of diastolic dysfunction. We sought to noninvasively estimate Tau (eTau) by speckle tracking echocardiography (STE) and to validate the eTau against Tau by catheterization. Tau was reported to be calculated using the isovolumic relaxation time (IVRT), LV end-systolic Pressure, and left atrial (LA) Pressure. We reported that pulmonary capillary wedge Pressure (ePCWP) can be noninvasively and accurately estimated as 10.8 − 12.4 × Log (LA active emptying function/minimum LA volume index). Therefore, the eTau by STE is noninvasively calculated using the formula: eTau = IVRT / (ln 0.9 × systolic blood Pressure−ln ePCWP). Echocardiographic parameters were measured just before catheterization in 110 patients with cardiac disease (age 72 ± 8). There was a good correlation between the eTau and Tau by catheterization (r = 0.69, p 48 ms) was 77% and 91%, respectively, with area under curve of 0.87 using an optimal cutoff of 48 ms. Bland-Altman analysis revealed a good agreement between the eTau and Tau. In conclusion, this study demonstrated that the eTau by our noninvasive method has a good correlation with Tau obtained by cardiac catheterization. LV relaxation may be noninvasively and accurately estimated by STE.
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Abstract 14584: Noninvasive Estimation of Time Constant of Left Ventricular Pressure Decline as an Index of Relaxation by Speckle Tracking Echocardiography; Validation Study by Cardiac Catheterization
Circulation, 2016Co-Authors: Itta Kawamura, Masanori Kawasaki, Ryuhei Tanaka, Takashi Yoshizane, Takashi Kato, Maki Saeki, Maki Nagaya, Koji Ono, Makoto Iwama, Masazumi AraiAbstract:Background: There has been no established echo parameter to accurately assess left ventricular (LV) relaxation as diastolic function. LV relaxation assessed by time constant of LV Pressure Decline (Tau) using left heart catheterization is reported to be deteriorated even in the early stage of hypertension. Thus, it is important to noninvasively evaluate LV relaxation in various cardiac diseases. We sought to noninvasively estimate Tau (eTau) by speckle tracking echocardiography (STE) and to validate eTau by Tau measured by cardiac catheterization. Methods: Isovolume relaxation time (IVRT) was reported to be measured as the time between end of LV outflow wave and beginning of inflow wave by Doppler echo. We reported that pulmonary capillary wedge Pressure (ePCWP) was accurately estimated as 10.8 - 12.4 x Log (left atrial active emptying function / minimum left atrial volume) by STE. Thus, the eTau by echo was obtained using the formula: eTau = IVRT / (ln 0.9 x systolic blood Pressure - ln ePCWP). Echo para...
Masazumi Arai - One of the best experts on this subject based on the ideXlab platform.
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Abstract 14584: Noninvasive Estimation of Time Constant of Left Ventricular Pressure Decline as an Index of Relaxation by Speckle Tracking Echocardiography; Validation Study by Cardiac Catheterization
Circulation, 2016Co-Authors: Itta Kawamura, Masanori Kawasaki, Ryuhei Tanaka, Takashi Yoshizane, Takashi Kato, Maki Saeki, Maki Nagaya, Koji Ono, Makoto Iwama, Masazumi AraiAbstract:Background: There has been no established echo parameter to accurately assess left ventricular (LV) relaxation as diastolic function. LV relaxation assessed by time constant of LV Pressure Decline (Tau) using left heart catheterization is reported to be deteriorated even in the early stage of hypertension. Thus, it is important to noninvasively evaluate LV relaxation in various cardiac diseases. We sought to noninvasively estimate Tau (eTau) by speckle tracking echocardiography (STE) and to validate eTau by Tau measured by cardiac catheterization. Methods: Isovolume relaxation time (IVRT) was reported to be measured as the time between end of LV outflow wave and beginning of inflow wave by Doppler echo. We reported that pulmonary capillary wedge Pressure (ePCWP) was accurately estimated as 10.8 - 12.4 x Log (left atrial active emptying function / minimum left atrial volume) by STE. Thus, the eTau by echo was obtained using the formula: eTau = IVRT / (ln 0.9 x systolic blood Pressure - ln ePCWP). Echo para...
Hitoshi Matsuo - One of the best experts on this subject based on the ideXlab platform.
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Validation by Cardiac Catheterization of Noninvasive Estimation of Time Constant of Left Ventricular Pressure Decline as an Index of Relaxation by Speckle Tracking Echocardiography
The American journal of cardiology, 2018Co-Authors: Takashi Yoshizane, Itta Kawamura, Masanori Kawasaki, Ryuhei Tanaka, Maki Nagaya, Koji Ono, Shingo Minatoguchi, Hidemaro Sato, Shinji Tomita, Hitoshi MatsuoAbstract:There has been no established echocardiographic parameter to accurately assess left ventricular (LV) relaxation. Impaired LV relaxation assessed by the time constant of LV Pressure Decline (Tau) is one of the major components of diastolic dysfunction. We sought to noninvasively estimate Tau (eTau) by speckle tracking echocardiography (STE) and to validate the eTau against Tau by catheterization. Tau was reported to be calculated using the isovolumic relaxation time (IVRT), LV end-systolic Pressure, and left atrial (LA) Pressure. We reported that pulmonary capillary wedge Pressure (ePCWP) can be noninvasively and accurately estimated as 10.8 − 12.4 × Log (LA active emptying function/minimum LA volume index). Therefore, the eTau by STE is noninvasively calculated using the formula: eTau = IVRT / (ln 0.9 × systolic blood Pressure−ln ePCWP). Echocardiographic parameters were measured just before catheterization in 110 patients with cardiac disease (age 72 ± 8). There was a good correlation between the eTau and Tau by catheterization (r = 0.69, p 48 ms) was 77% and 91%, respectively, with area under curve of 0.87 using an optimal cutoff of 48 ms. Bland-Altman analysis revealed a good agreement between the eTau and Tau. In conclusion, this study demonstrated that the eTau by our noninvasive method has a good correlation with Tau obtained by cardiac catheterization. LV relaxation may be noninvasively and accurately estimated by STE.
Koji Ono - One of the best experts on this subject based on the ideXlab platform.
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Validation by Cardiac Catheterization of Noninvasive Estimation of Time Constant of Left Ventricular Pressure Decline as an Index of Relaxation by Speckle Tracking Echocardiography
The American journal of cardiology, 2018Co-Authors: Takashi Yoshizane, Itta Kawamura, Masanori Kawasaki, Ryuhei Tanaka, Maki Nagaya, Koji Ono, Shingo Minatoguchi, Hidemaro Sato, Shinji Tomita, Hitoshi MatsuoAbstract:There has been no established echocardiographic parameter to accurately assess left ventricular (LV) relaxation. Impaired LV relaxation assessed by the time constant of LV Pressure Decline (Tau) is one of the major components of diastolic dysfunction. We sought to noninvasively estimate Tau (eTau) by speckle tracking echocardiography (STE) and to validate the eTau against Tau by catheterization. Tau was reported to be calculated using the isovolumic relaxation time (IVRT), LV end-systolic Pressure, and left atrial (LA) Pressure. We reported that pulmonary capillary wedge Pressure (ePCWP) can be noninvasively and accurately estimated as 10.8 − 12.4 × Log (LA active emptying function/minimum LA volume index). Therefore, the eTau by STE is noninvasively calculated using the formula: eTau = IVRT / (ln 0.9 × systolic blood Pressure−ln ePCWP). Echocardiographic parameters were measured just before catheterization in 110 patients with cardiac disease (age 72 ± 8). There was a good correlation between the eTau and Tau by catheterization (r = 0.69, p 48 ms) was 77% and 91%, respectively, with area under curve of 0.87 using an optimal cutoff of 48 ms. Bland-Altman analysis revealed a good agreement between the eTau and Tau. In conclusion, this study demonstrated that the eTau by our noninvasive method has a good correlation with Tau obtained by cardiac catheterization. LV relaxation may be noninvasively and accurately estimated by STE.
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Abstract 14584: Noninvasive Estimation of Time Constant of Left Ventricular Pressure Decline as an Index of Relaxation by Speckle Tracking Echocardiography; Validation Study by Cardiac Catheterization
Circulation, 2016Co-Authors: Itta Kawamura, Masanori Kawasaki, Ryuhei Tanaka, Takashi Yoshizane, Takashi Kato, Maki Saeki, Maki Nagaya, Koji Ono, Makoto Iwama, Masazumi AraiAbstract:Background: There has been no established echo parameter to accurately assess left ventricular (LV) relaxation as diastolic function. LV relaxation assessed by time constant of LV Pressure Decline (Tau) using left heart catheterization is reported to be deteriorated even in the early stage of hypertension. Thus, it is important to noninvasively evaluate LV relaxation in various cardiac diseases. We sought to noninvasively estimate Tau (eTau) by speckle tracking echocardiography (STE) and to validate eTau by Tau measured by cardiac catheterization. Methods: Isovolume relaxation time (IVRT) was reported to be measured as the time between end of LV outflow wave and beginning of inflow wave by Doppler echo. We reported that pulmonary capillary wedge Pressure (ePCWP) was accurately estimated as 10.8 - 12.4 x Log (left atrial active emptying function / minimum left atrial volume) by STE. Thus, the eTau by echo was obtained using the formula: eTau = IVRT / (ln 0.9 x systolic blood Pressure - ln ePCWP). Echo para...